<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var car = (function() {
            var start = 13;
            var total = 0;
            return {
                price: function(n) {
                    if (n <= 3) {
                        total = 13;
                    } else {
                        total = start + (n - 3) * 5;
                    }
                    return total;
                },

            }
        })();
        console.log(car.price(5));
    </script>
</body>

</html>